Scientists investigate the distribution of a moss species. They record the number of woodland plots occupied by the moss in four regions. Fifty plots are surveyed in each region.
| Region | Mean summer temperature / °C | Mean soil water content / % | Number of plots occupied |
|---|---|---|---|
| J | 13 | 28 | 42 |
| K | 13 | 12 | 20 |
| L | 17 | 28 | 26 |
| M | 17 | 12 | 8 |
A conservation group plans to irrigate region M. This would increase the mean soil water content in region M from 12% to 28%. The mean summer temperature would remain at 17 °C.
Using the data, evaluate the claim that irrigation will make the moss as widely distributed in region M as it is in region J.
83 exam-style questions on AQA GCSE Biology 7.2 Organisation of an ecosystem, covering 7.2.1 Levels of organisation, 7.2.2 How materials are cycled, 7.2.3 Decomposition, and 7.2.4 Impact of environmental change (HT only). Each one has a worked solution and a mark scheme showing where the marks go.